In 2004, the Geosynthetics International (GI) published a special issue on GCLs that was well received (Geosynthetic Clay Liners I). In the 2004 special issue, a state-of-the-art report titled: GCL Shear Strength and Its Measurement was published by the authors. In particular, the 2004 state-of-the-art report discusses testing techniques, variables, displacement rates, post-shear investigations, shear stress-displacement behavior, shear strength interpretation, recommendations for GCL shear strength for slope stability analyses, and future research needs. This paper presents a summary of the major changes to the 2004 state-of-the-art report that appear in the second special issue of GI on GCLs (Geosynthetic Clay Liners II) in 2015. The three areas significantly augmented since the 2004 state-of-the-art report in 2015 Geosynthetic Clay Liners II are: dynamic shear strength, creep shear testing, and design strength envelopes for encapsulated GCLs, which are briefly summarized herein.
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